[jboss-cvs] jboss-seam/src/main/org/jboss/seam/util ...

[Shane Bryzak]

  User: sbryzak2
  Date: 07/06/17 19:30:40

  Added:       src/main/org/jboss/seam/util  Hex.java
  Log:
  JBSEAM-1476 removed commons-codec
  
  Revision  Changes    Path
  1.1      date: 2007/06/17 23:30:40;  author: sbryzak2;  state: Exp;jboss-seam/src/main/org/jboss/seam/util/Hex.java
  
  Index: Hex.java
  ===================================================================
  package org.jboss.seam.util;
  
  /**
   * Hex encoder and decoder, ripped off from commons-codec.  DecoderException and
   * EncoderException have been replaced by RuntimeException
   * 
   * @author Apache Software Foundation
   */
  public class Hex
  {
  
     /** 
      * Used building output as Hex 
      */
     private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a',
              'b', 'c', 'd', 'e', 'f' };
  
     /**
      * Converts an array of characters representing hexidecimal values into an
      * array of bytes of those same values. The returned array will be half the
      * length of the passed array, as it takes two characters to represent any
      * given byte. An exception is thrown if the passed char array has an odd
      * number of elements.
      * 
      * @param data An array of characters containing hexidecimal digits
      * @return A byte array containing binary data decoded from
      *         the supplied char array.
      * @throws RuntimeException Thrown if an odd number or illegal of characters 
      *         is supplied
      */
     public static byte[] decodeHex(char[] data) throws RuntimeException
     {
  
        int len = data.length;
  
        if ((len & 0x01) != 0)
        {
           throw new RuntimeException("Odd number of characters.");
        }
  
        byte[] out = new byte[len >> 1];
  
        // two characters form the hex value.
        for (int i = 0, j = 0; j < len; i++)
        {
           int f = toDigit(data[j], j) << 4;
           j++;
           f = f | toDigit(data[j], j);
           j++;
           out[i] = (byte) (f & 0xFF);
        }
  
        return out;
     }
  
     /**
      * Converts a hexadecimal character to an integer.
      *  
      * @param ch A character to convert to an integer digit
      * @param index The index of the character in the source
      * @return An integer
      * @throws RuntimeException Thrown if ch is an illegal hex character
      */
     protected static int toDigit(char ch, int index) throws RuntimeException
     {
        int digit = Character.digit(ch, 16);
        if (digit == -1)
        {
           throw new RuntimeException("Illegal hexadecimal charcter " + ch + " at index " + index);
        }
        return digit;
     }
  
     /**
      * Converts an array of bytes into an array of characters representing the hexidecimal values of each byte in order.
      * The returned array will be double the length of the passed array, as it takes two characters to represent any
      * given byte.
      * 
      * @param data
      *                  a byte[] to convert to Hex characters
      * @return A char[] containing hexidecimal characters
      */
     public static char[] encodeHex(byte[] data)
     {
  
        int l = data.length;
  
        char[] out = new char[l << 1];
  
        // two characters form the hex value.
        for (int i = 0, j = 0; i < l; i++)
        {
           out[j++] = DIGITS[(0xF0 & data[i]) >>> 4];
           out[j++] = DIGITS[0x0F & data[i]];
        }
  
        return out;
     }
  
     /**
      * Converts an array of character bytes representing hexidecimal values into an
      * array of bytes of those same values. The returned array will be half the
      * length of the passed array, as it takes two characters to represent any
      * given byte. An exception is thrown if the passed char array has an odd
      * number of elements.
      * 
      * @param array An array of character bytes containing hexidecimal digits
      * @return A byte array containing binary data decoded from
      *         the supplied byte array (representing characters).
      * @throws RuntimeException Thrown if an odd number of characters is supplied
      *                   to this function
      * @see #decodeHex(char[])
      */
     public byte[] decode(byte[] array) throws RuntimeException
     {
        return decodeHex(new String(array).toCharArray());
     }
  
     /**
      * Converts a String or an array of character bytes representing hexidecimal values into an
      * array of bytes of those same values. The returned array will be half the
      * length of the passed String or array, as it takes two characters to represent any
      * given byte. An exception is thrown if the passed char array has an odd
      * number of elements.
      * 
      * @param object A String or, an array of character bytes containing hexidecimal digits
      * @return A byte array containing binary data decoded from
      *         the supplied byte array (representing characters).
      * @throws RuntimeException Thrown if an odd number of characters is supplied
      *                   to this function or the object is not a String or char[]
      * @see #decodeHex(char[])
      */
     public Object decode(Object object) throws RuntimeException
     {
        try
        {
           char[] charArray = object instanceof String ? ((String) object).toCharArray()
                    : (char[]) object;
           return decodeHex(charArray);
        }
        catch (ClassCastException e)
        {
           throw new RuntimeException(e.getMessage());
        }
     }
  
     /**
      * Converts an array of bytes into an array of bytes for the characters representing the
      * hexidecimal values of each byte in order. The returned array will be
      * double the length of the passed array, as it takes two characters to
      * represent any given byte.
      *
      * @param array a byte[] to convert to Hex characters
      * @return A byte[] containing the bytes of the hexidecimal characters
      * @see #encodeHex(byte[])
      */
     public byte[] encode(byte[] array)
     {
        return new String(encodeHex(array)).getBytes();
     }
  
     /**
      * Converts a String or an array of bytes into an array of characters representing the
      * hexidecimal values of each byte in order. The returned array will be
      * double the length of the passed String or array, as it takes two characters to
      * represent any given byte.
      *
      * @param object a String, or byte[] to convert to Hex characters
      * @return A char[] containing hexidecimal characters
      * @throws RuntimeException Thrown if the given object is not a String or byte[]
      * @see #encodeHex(byte[])
      */
     public Object encode(Object object) throws RuntimeException
     {
        try
        {
           byte[] byteArray = object instanceof String ? ((String) object).getBytes()
                    : (byte[]) object;
           return encodeHex(byteArray);
        }
        catch (ClassCastException e)
        {
           throw new RuntimeException(e.getMessage());
        }
     }
  
  }